10 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 78 



Front 0.25 of head width, the same for almost its whole length; 

 parafrontals and parafacials with golden pollen, the former wider 

 than middle stripe, latter as wide as the rather narrow third antennal 

 joint; cheek and posterior orbit concolorous; back of head with 

 black hair, the pale confined to a small area below neck. Verticals 

 2, outer half as long as inner; ocellars minute, proclinate; 7 dis- 

 tinct pairs of frontals, the uppermost one reclinate, not much dif- 

 ferentiated from the rest, lowest at base of antennae; the frontal 

 rows diverge slightly below, but do not approach orbits. Facial 

 ridges bare except a few hairs next to vibrissae, which are at the oral 

 margin; palpi black; proboscis small. Antennae black, third joint 

 a little over twice the second, rather slender. 



Thorax gray poUinose, tinged with yellow (which is less evident 

 now than indicated by Wiedemann), with three distinct brown 

 stripes and a brown spot on supraalars. Chaetotaxy : dorsocentral 

 2, 3; acrostichal 0, 0; humeral 2; posthumeral 1 (inner) ; presutural 

 1; notopleural 2; supraalar 3 (only the middle of any size) ; intra- 

 alar 1 ; postalar 2 ; sternopleural 2 ; scutellum with 3 lateral (middle 

 weak), one small subdiscal, no apical. Calypters white, rim the 

 same. 



Abdomen blackish above, the gray pollen thin, on second and 

 third segments confined to a narrow basal region, two submedian 

 stripes not reaching the hind margins, and a lateral basal triangle 

 continuing below; fourth segment gray except on apical half in 

 middle region. First segment without median marginals, second 

 with marginal appressed bristly hairs, third with marginal row 

 of 8, fourth with row of 12, of which the outer are small. Genital 

 segments small, first brown with yellow pollen and one pair of 

 bristles, second reddish. Genitalia as in Figure 21. Forceps small, 

 reddish, quite flat, straight, uniformly tapering, the tips black, sharp. 

 Accessory plates (outer forceps) small, narrow, reddish yellow, with 

 sharp tips. Penis in the single specimen strongly bent forward 

 at middle, the stalk yellow, head black, shining. Fifth sternite 

 almost invisible, the three intermediate ones large, with soft hair. 



Legs black, tibiae brownish; pulvilli but little enlarged; no vil- 

 losity on tibiae ; middle femur at tip below on hind side with a few 

 short bristles, not however forming a comb; middle tibia with one 

 bristle on outer front side, lower down than usual (at second third). 



Wings brown, the color uniform as Wiedemann says. Bend of 

 fourth vein rectangular, with small appendage; first vein bare, 

 third setulose halfway to cross vein. Hind cross vein joining fourth 

 vein at second third of distance between anterior crossvein and 

 bend. 



Length 8 mm. 



